drm: tilcdc: Implement whitelist & blacklist mode support

Some modes just don't work; so we need a way to control which ones
we select. Implement a DT based whitelist & blacklist.

Signed-off-by: Pantelis Antoniou <panto@antoniou-consulting.com>
capes: boneblack HDMI capes have blacklisted modes.

Added a few modes that are known not to work on my end.

Signed-off-by: Pantelis Antoniou <panto@antoniou-consulting.com>